UBUNTU-CVE-2019-1559

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UBUNTU-CVE-2019-1559

Summary:

Details: If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0 byte record is received with invalid padding compared to if a 0 byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q).

References: https://ubuntu.com/security/CVE-2019-1559, https://www.openssl.org/news/secadv/20190226.txt, https://github.com/RUB-NDS/TLS-Padding-Oracles, https://ubuntu.com/security/notices/USN-3899-1, https://ubuntu.com/security/notices/USN-4376-2, https://www.cve.org/CVERecord?id=CVE-2019-1559